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Old 11th Nov 2017, 05:59 AM   #1
Starbase1
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Default LightWave - Gradually revealing a trajectory?

OK, here's an overview of the scene I have in mind.

I'm planning a view of the inner solar system, with simple hoops representing the planets orbits. And small sphere's moving along those hoops to show motion along the orbit. All very highly stylised. The objective is to make a 3d arrangement clear,not any sort of realism.

Anyway, I want to show the trajectory of a probe, which will curve in from earth to Venus, where it is diverted up to pass over the Sun, and meet Venus again on the other side, where it is diverted in close to the sun.

Now I can make a 2 point poly chain in modeller, of the required shape. This could then be used to guide a rail extrude to mark out the path. With me so far?

Now what I want to do with this trajectory path object is reveal it gradually, from starting point to finish. So for example, if it was a simple luminous white texture, this would appear to grow along trajectory, like the spacecraft was leaving a luminous path behind it.

Any ideas on how this might be achieved?
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Old 11th Nov 2017, 07:16 AM   #2
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weight map.
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Old 11th Nov 2017, 08:29 AM   #3
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Errr...
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Old 13th Nov 2017, 02:21 PM   #4
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I meant to use a weight map to control the visibility of the object.
You could use a gradient on the transparency and animate it over time to move the point at which the object changes from transparent to opaque along the weight map.
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Old 19th Nov 2017, 03:58 AM   #5
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Quote:
Originally Posted by Starbase1 View Post
Now I can make a 2 point poly chain in modeller, of the required shape. This could then be used to guide a rail extrude to mark out the path. With me so far?
I would go with a uv mapped rail extrude, and use an gradient image on the animated uv map to reveal it. (See attached object You need dp nodes for this....just animate the y value of the add node.)
The other way to do this natively is to use the textured filter in the image tab and animate a secondary gradient image on top of it.

hope this helps
chris
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File Type: zip reveal.zip (3.3 KB, 8 views)
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Old 19th Nov 2017, 04:00 AM   #6
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Also you could use a real gradient image to slowly fade out the trajectory after a certain distance, but this might need node tweaking
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Old 19th Nov 2017, 05:41 AM   #7
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Thank You!
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